Computer Simulation of Solidification of Nodular Cast Iron

Su, Kou-Chang; Ohnaka, Itsuo; Yamauchi, Isamu; Fukusako, Tatsuichi

doi:10.1557/proc-34-181

Cited by 29 publications

(21 citation statements)

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“…Dardati et al 20 compared one model based on the uninodular theory by Su et al 7 and two models based on the multinodular theory presented in Boeri 18 and Dardati et al 21 In terms of nodule count the three models showed very similar results with each other and showed a good agreement with the experimental ones. Regarding the cooling curves, the slope of the model developed by Dardati et al 21 differs from the experimental one during the first cooling stage and also shows the smallest undercooling compared with the other two models and with the experimental one.…”

mentioning

confidence: 84%

“…It is widely accepted that the growth kinetics of nodular cast iron is primarily controlled by solid state diffusion of carbon through the austenite shell. 6,7 Two models based on either deterministic laws or stochastic procedures describe the growth mechanism and the solidification process of eutectic nodular cast iron: uninodular [7][8][9][10][11][12][13][14][15][16] and multinodular [17][18][19][20][21] models. The former considers that spherical graphite nuclei are immediately enveloped by an austenite shell and subsequent growth occurs by carbon diffusion through this envelope.…”

Section: Introductionmentioning

confidence: 99%

“…It appeared challenging to compare the multinodular model by Boeri 18 to the uninodular model developed by Lesoult et al 8,9 which is more elaborated than the early model by Su et al 7 These models were thus implemented in a micro-macroscopic code. At a macrolevel, the heat equation is solved using the finite element method, whereas the solidification process at the microlevel is modelled using rules for nucleation and growth.…”

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confidence: 99%

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Experimental and numerical analysis of effect of cooling rate on thermal–microstructural response of spheroidal graphite cast iron solidification

Escobar

Celentano

Cruchaga

et al. 2013

International Journal of Cast Metals Research

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This work presents an experimental and numerical study of the solidification process of an eutectic spheroidal graphite cast iron (SGI). The effect of the cooling rate on the thermal-microstructural response is particularly analysed. To this end, experiments as well as numerical simulations were carried out. The experiments consisted in a solidification test in a wedge-like casting such that different cooling rates were measured at specific positions along the part. A metallographic analysis was also performed in five locations of the sample with the aim of obtaining the number and size of graphite nodules at the end of the process. The numerical simulations were made using multinodular based and uninodular based models. These two models predicted similar results in terms of cooling curves and nodule counts. Besides, good experimental-numerical agreements were obtained for both the cooling curves and the graphite nodule counts.

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confidence: 84%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Experimental and numerical analysis of effect of cooling rate on thermal–microstructural response of spheroidal graphite cast iron solidification

Escobar

Celentano

Cruchaga

et al. 2013

International Journal of Cast Metals Research

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“…Several models have been proposed to describe the kinetic mechanisms that occur during the liquid-solid transformation of a SGCI with eutectic composition, some of them being based on the uninodular theory [5][6][7][8][9][10][11][12][13][14] and others based on the multinodular theory [15][16][17][18][19]. Nevertheless, the so-called multinodular models are nowadays gaining acceptance due to their good prediction capabilities.…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Pouring Temperature on Spheroidal Graphite Cast Iron Solidification

Escobar

Celentano

Cruchaga

et al. 2015

Metals

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This work is focused on the effect of pouring temperature on the thermal-microstructural response of an eutectic spheroidal graphite cast iron (SGCI). To this end, experiments as well as numerical simulations were carried out. Solidification tests in a wedge-like part were cast at two different pouring temperatures. Five specific locations exhibiting distinct cooling rates along the sample were chosen for temperature measurements and metallographic analysis to obtain the number and size of graphite nodules at the end of the process. The numerical simulations were performed using a multinodular-based model. Reasonably good numerical-experimental agreements were obtained for both the cooling curves and the graphite nodule counts.

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“…Castings made of this material not only have a low weight, but also very good mechanical properties [3][4][5]. For this reason, nodular graphite cast iron continues being the object of studies using different mathematical models, the main task of which is the best approximation of processes that occur during crystallisation of this alloy [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Application of Averaged Voronoi Polyhedron in the Modelling of Crystallisation of Eutectic Nodular Graphite Cast Iron

Burbelko¹,

Początek²,

Królikowski³

2013

Archives of Foundry Engineering

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The study presents a mathematical model of the crystallisation of nodular graphite cast iron. The proposed model is based on micro-and macromodels, in which heat flow is analysed at the macro level, while micro level is used for modelling of the diffusion of elements. The use of elementary diffusion field in the shape of an averaged Voronoi polyhedron [AVP] was proposed. To determine the geometry of the averaged Voronoi polyhedron, Kolmogorov statistical theory of crystallisation was applied. The principles of a differential mathematical formulation of this problem were discussed. Application of AVP geometry allows taking into account the reduced volume fraction of the peripheral areas of equiaxial grains by random contacts between adjacent grains. As a result of the simulation, the cooling curves were plotted, and the movement of "graphite-austenite" and "austenite-liquid" phase boundaries was examined. Data on the microsegregation of carbon in the cross-section of an austenite layer in eutectic grains were obtained. Calculations were performed for different particle densities and different wall thicknesses. The calculation results were compared with experimental data.

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Computer Simulation of Solidification of Nodular Cast Iron

Abstract: Solidification of a nodular iron casting was simulated byanundercooling nucleation and diffusion controlled growth model. Simulated cooling curves were similar to measured ones but estimating nodular size distribution requires improving the model.

Cited by 29 publications

References 1 publication

Experimental and numerical analysis of effect of cooling rate on thermal–microstructural response of spheroidal graphite cast iron solidification

Experimental and numerical analysis of effect of cooling rate on thermal–microstructural response of spheroidal graphite cast iron solidification

On the Effect of Pouring Temperature on Spheroidal Graphite Cast Iron Solidification

Application of Averaged Voronoi Polyhedron in the Modelling of Crystallisation of Eutectic Nodular Graphite Cast Iron

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